aqueduct
big
blue
concrete
construction
county
dam
distribution
drinking
electricity
energy
engineering
environment
environmental
forest
gas
generation
hydro
hydroelectric
industrial
industry
installation
metal
natural
nature
oil
penstock
pipe
pipeline
piping
plant
power
pressure
pumped
renewable
river
stair
station
steel
storage
substation
sunset
supply
system
transport
transportation
tube
utility
valve
water
定額
double green penstock for transfer a lot of water for generate electric power.の素材 [FY310147259577]
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